package com.hafu.util;

public class StringUtl {
    public static boolean isEmpty(String str) {
        return str == null || str.trim().length() == 0;
    }
    public static void main(String[] args) {
        String s1 = null;
        String s2 = "";
        System.out.println(s2);
        System.out.println(s1);
        System.out.println(isEmpty(s1));
        System.out.println(isEmpty(s2));
    }
}
